Electrical connection



\ A. HOROWITZ ELECTRICAL CONNECTION April 11, 1950 Filed April 20, 1946 All Mm HOROWZT Z.

IN VEN TOR.

ATTORNEY.

tact members of the two Patented Apr. 11, 1950 Alexandrellorowltx, r lignor meme mum Application In and'l'rustCom Iindlmven, Netherlands, ao-

entl, to Hartford Namay. Hartf rd.

April 20, 1946, Sen-hi No. 603,680

the Netherlands March 18, 1942 Section 1, Public Law 690, August 8, 1948 Patent expires March 1 4 Claims. (Cl. 173-824) 1 This invention relates to a contact for the parts, for example a discharge tube and a tuning coil for radio purposes, very short connections being formed between these parts. Short connections are particularly of importance in receiving sets, ampliflers or generators for oscillations of very short wavelength, in which the connections in the tuned circuit must be maintained very short for the purpose of reducing the inductance in the circuit.

With the usual constructions of electric contacts, such as are used in chassis or in switchable tuning units combined, it necessary, with tube holders, one has already adopted the method of arranging the contacts in a highly compact manner, for parts which are to be placed closely together in co-operating relationship, but there still exsisted a non-negligible connecting length between the contacts from one to another part. It was thus not possible in all instances to obtain a sumciently low inductance value of the connections.

The present invention has for its p to reduce this connecting length to the extreme minimum which is mechanically possible whilst retaining satisfactory resilience, so that the shortest possible wave length may be used.

According to the invention, for this purpose use is made of a double contact into which the contact members of the two parts may be pushed 1 closely together, said double contact constituting itself a substantially rectilinear and extremely short electric transverse connection between the two contact members.

In the described manner it is possible to obtain between the two electric parts a connecting length which is smaller than the sum of the connecting lengths from each part to the extremity of the contact member concerned. As a matter offact, it is possible to provide the transverse connection in such manner that part of the length of the contact member is not traversed by cur-- rent, while the transverse connection may be shorter than the sum of those lengths of the contact members which are not traversed by current.

The foregoing particularly applies when use is made of a double contact into which the conparts may be pushed in the same direction closely along'each other, but in the opposite sense, while the extension of the double contact in the direction of pushing is small.

It is particularl advantageous to constitute 2 the double contact by two which, together with a connecting strip, have been punched in one piece in double T-shape from the sheet of contact material. After punching the arms of each 1 are brought into a relatively parallel position by bending the connecting strip to form a U-shape, it being possible to utilize the connecting strip for the fastening to the insulating carrier and, if desired, also for connecting a supply conductor. Each of the contact springs on each side of the connecting strip has a shape which is such that a contact member may be pushed therebetween.

One thus has the advantage that on the one hand an extremely short transverse connection is obtained and on the other hand use may be made of a connecting strip having a suillcient length to ensure satisfactory resilience of the plates relatively to each other and a uniform distribution of the contact pressure.

Another advantageous form of construction of the invention is a double contact having two separate flat contact springs which extend substantially in parallel to each other and which may plane contact springs adlacent halves of the one and of the other spring, while the latter are kept together by a separate Fig. l is a central contact member invention;

Fig. 2 is a face view of one of said contact members with the cross-sectional view of Fig. 1 indicated thereon by the line I-I:

Fig. 3 is a cross-sectional view of.the contact member of Figs. 1 and 2 taken along the line III-1H of Fig. 2;

Fig. 4 is a face view of invention during the cross-sectional view of a of one embodiment of the a contact spring of the manufacture thereof;

Fig. is a plan view of a contact spring of the invention after it has been formed into its proper shape ready for use;

Fig. 6 is a longitudinal cross-sectional view of the contact spring of Fig. 5;

Fig. 7 is a central transverse cross-sectional view of the contact spring as shown in Fig. 6;

Fig. 8 is a view of two of the contact members of Figs. 1 to 3, inclusive, with contact pins inserted therebetween and with the contact spring of Figs. 5 to '7, inclusive, employed to urge two of said contact members together;

Fig. 9 is a plan view from the lefthand side of Fig. 8 of the assembled contact members and spring with pins inserted;

Fig. 10 is a transverse cross-sectional view along the lines X--X of Fig. 8;

Fig. 11 is a view partially in cross-section and with portions removed for clarity of another embodiment of the invention showing a contact device with terminal pins in place;

Fig. 12 is a longitudinal cross-sectional view of the device of Fig. 11 along the lines XII-X[I with all parts in place; and

Fig. 13 is a transverse cross-sectional view of the embodiment of Fig. 11.

Like parts are indicated by like reference numerals throughout.

Figs. 1 to 3 show a contact spring [2 constituted by two parts 1 and 2, each of which makes contact with one of the contact members which have to be relatively connected, these parts being connected themselves by means of transverse connections 3 between which an elongated hole I is punched out. As will appear later, these contact springs are used pairwise, their arched portions 5 engaging each other so that the slanting parts 6 at each extremity diverge and permit of pushing contact pins between the springs.

A clamping spring 13 shown in Figs. 4 to '7 serves to keep two of the described contact springs together. The development of Fig. 4 shows that the spring comprises punched out tags 8 and 9 which serve to interlock on bending the spring into its definite shape, as is shown in Fig. 5. In addition, tags ID are punched out, which as will appear later, will serve in fastening the clamping spring in the insulating material, these tags then being bent outwardly, as can be seen in Fig. '7. In the middle are two fastening holes II.

Figs. 8 to 10 show a double contact constituted by contact springs 12 which are kept together by means of a clamping spring [3 which in turn is fast in the insulating material of a holder l4, part of which only is illustrated. It can be seen from Fig. 10 how the contact springs H in the position shown in Fig. 2 are urged together, so that the divergingly bent parts 6 are visible. In this case the clamping spring I! in the position shown in Fig. 7 is in a cylindrical recess of the insulating material, into which it may consequently be introduced in a direction normal to the plane of the drawing. It is thus movable only in the direction in which it is inserted until the tags l0 have expanded.

In this manner the fastening is very simple and requires no special fastening material. The tags 3 and 9 of the clamping spring l3 cooperate to press the resilient plates I! together. the tag 8 being passed through'the elongated hole 4 of the springs and keeping the latter in the correct position. In this case the straight parts M and 22 of the clamping spring press into the groove 3 of each contact spring and serve for the transfer 24 are pushed between the springs i2 and are in close proximity to each other, these pins overlapping each other in the direction of insertion. The electrical connection by means of the parts 3 of the contact springs is extremely short so that the purpose of the invention which consists in attaining the minimum possible length of connection is fully realized. In this case the contact pressure exerted on the two pins is distributed with complete uniformity due to the points of pressure applied by the clamping spring l3 being located exactly in the middle between the axes of the two contact pins 23 and 24. The material used for the springs 12 and 13 may advantageously be Phosphor bronze which is silverplated subsequent to the formation of the spring.

The range of application of the described double contacts is very large. It is thus possible, for example, to connect contact pins of radio tubes to contact pins of multiplex tuning coils, so that for any wave range an excellent electric contact may be made with another set of pins of the coils, this excellent contact being also a result of the selfcleaning action of the friction contact obtained.

Figs. 11 to 13 show a second contact shape, two parts l5 placed in parallel with each other being connected by means of a U-shaped elongated connecting piece IS. The parts i5 comprise upwardly and downwardly extending edges 11 which are bent to the exterior and enable contact members i8 and H to be pushed into the gap which exists between the parts l5, and this symmetrically relatively to the longitudinal axis of the T, so that-the resilience of the connecting piece may equally act upon the two contact members. The base of the U is anchored in an approximately cylindrical recess, of a carrier 20 of insulating material by means of tags 2! l which may serve in addition, for the connection of supply conductors.

I claim:

1. A contact device for an electrical connection between two terminal pin-like members, comprising a pair of contact members extending in substantially parallel adjacent planes and each having a central portion and first and second wing portions extending from said central portion, said central portion providing a transverse electrical connection between said wing portions, spring means including a yoke-like element and arms extendingthereirom, said arms supporting said contact members at said central portions thereof and urging together the said contact members, said first wing portions facing each other and being adapted to receive therebetween one of said terminal pin-like members transversely of said central electrical connection portion and said second wing portions facing each other and being adapted to receive therebetween the other of said terminal pin-like members transversely of said central electrical connection portion and substantially parallel to said one terminal pin-like member, said contact members being rotatable about the central portion thereof, whereby upon insertion of said terminal pin-like members in said respective wing portions a uniform distribution of the contact pressure is attained.

2. A contact device for an electrical connection between two terminal pin-like members, comprising a pair of contact members extending in substantially parallel adjacent planes and each having a central portion and first and second wing portions extending from said central portion, said central portion providing a transof the clamping pressure. Contact pins 23 and verse electrical connection between saidwingportions, spring means including a yoke-like element and arms extending therefrom, said arms supporting said contact members at said central portions thereof and urging together the said contact members, said first wing portions facing each other in flared relationship and being adapted to receive therebetween one of said terminal pinlike members transversely of said central electrical connection portion and said second wing portions facing each other in flared relationship and being adapted to receive therebetween the other of said terminal pin-like members transversely of said central electrical connection portion and substantially parallel to said one terminal pin-like member, said contact members being rotatable about the central portion thereof, whereby upon insertion of said terminal pin-like members in said respective wing portions a uniform distribution of the contact pressure is attained.

3. A contact device for an electrical connection between two terminal pin-like members comprising, a pair of contact members extending in substantially parallel adjacent planes and each having a central portion and first and second wing portions extending from said central portion, said central portion providing a transverse electrical connection between said wing portions, spring means having arms terminating in grasping relationship against and supporting said contact members at said central portions thereof and urging together the said contact members, said first wing portions facing each other and being adapted to receive therebetween one of said terminal pin-like'members transversely of said central electrical connection portion and said second wing portions facing each other and being adapted to receive therebetween the other of said terminal pin-like members transversely of said central electrical connection portions and substantially parallel to said one terminal pin-like member, said contact members being rotatable about the central portion thereof, whereby upon insertion of said terminal pin-like members in said respective wing portions a uniform distribution of the contact pressure is attained.

4. A contact device for an electrical connection between two terminal pin-like members. comprising a pair of contact members extending in substantially parallel adjacent planes and each having a central portion and first and second wing portions extending from said central portion, said central portion providing a transverse electrical connection between said wing portion, spring means supporting the said contact members at the said central portions and urging together both the said members with said first wing portions facing each other and being adapted to receive therebetween one of said terminal pin-like members transversely of said central electrical connection portion and said second wing portions facing each other and being adapted to receive therebetween the other of said terminal pin-like members transversely of said ,central electrical connection portion and substantially parallel to said one terminal pinlike member, said spring means comprising two arms extending transversely to the said pin-like members, said arms terminating in parts each of which bears against one of said contact members to urge together the said members, said contact members being rotatable about the central portion thereof whereby upon insertion of said terminal pin-like members in said respective wing portions a uniform distribution of contact pressure is attained.

ALEXANDRE HOROWITZ.

REFERENCES CITED The following references are of record in the file of this patent:

Wade Dec. 14, 1943 

